def from_json(cls, json_world):
point_index = {}
points = set()
json_points = json_world[cls.JSON_KEY_POINTS]
for point_type_key, point_class in [
(cls.JSON_KEY_FOOD_POINTS, FoodPoint),
(cls.JSON_KEY_ANTHILL_POINTS, AnthillPoint),
(cls.JSON_KEY_ORDINARY_POINTS, Point),
]:
for json_point in json_points[point_type_key]:
p = point_class.from_json(json_point)
point_index[p.coordinates] = p
points.add(p)
edges = set()
for json_edge in json_world[cls.JSON_KEY_EDGES]:
e = Edge.from_json(json_edge, point_index)
e.register_with_points()
edges.add(e)
return cls(points, edges)
